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Title: Pressure-induced densification in GeO{sub 2} glass: A transmission x-ray microscopy study

Nanoscale transmission x-ray microscopy measurements have been performed to determine the effect of pressure (P) on the volume (V) change in GeO{sub 2} glass up to 38.5 GPa. The P-V data show a continuous increase upon compression, indicating that the density-driven structural transformation is a gradual process. Over the pressure range studied, a transition is observed at approximately 10–13 GPa, where the material displays distinct compression behaviors. The pressure-induced densification that involves the coordination number change has been discussed. Using this newly developed high-pressure imaging technique with tens of nanometer resolution, we have provided a direct and unequivocal way for measuring density of amorphous materials to much higher pressures with accuracy rivaling x-ray diffraction of crystalline solids.
Authors:
;  [1] ;  [2] ;  [1] ;  [3]
  1. Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305 (United States)
  2. High Pressure Synergetic Consortium, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439 (United States)
  3. (United States)
Publication Date:
OSTI Identifier:
22253144
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 26; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COMPRESSION; DENSITY; GERMANATES; GERMANIUM OXIDES; GLASS; MICROSCOPY; RESOLUTION; SOLIDS; TRANSMISSION; X RADIATION; X-RAY DIFFRACTION